Demi Moore: "Her Life Is Completely in Crisis" (omg!)

Demi's darkest hour.

Demi Moore turns 50 this November -- and it appears the Margin Call actress, on the heels of her devastating split from Ashton Kutcher, is now suffering a full-blown mid-life crisis.

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After weeks of hard-core partying at various spots around Hollywood, it all came to a head on Monday evening, when the painfully skinny star called 911, was rushed to a hospital, and explained through her rep that she's seeking "professional assistance to treat her exhaustion and improve her overall health."

An insider confirms to Us Weekly that Moore suffered a seizure on Monday, prompting her 911 call. (TMZ claims that Moore was doing "whip-its," inhaling nitrous oxide, to get high.)

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"She has spiraled," the source explains, "and gotten to a place where she is struggling too much to function."

She announced her split from Kutcher, 33, in November, following his September affair (on their sixth wedding anniversary) with 22-year-old Sara Leal.

VIDEO: Sara Leal talks up her Ashton affair to Us

"Her life is completely in crisis," continues the source. "She is turning 50 and has no idea who she is or what her focus should be."

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